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dc.contributor.authorZhang, P.
Richard, P.
Qian, T.
Shi, X.
Ma, J.
Zeng, L.-K.
Wang, X.-P.
Rienks, E.
Zhang, C.-L.
Dai, Pengcheng
You, Y.-Z.
Weng, Z.-Y.
Wu, X.-X.
Hu, J.P.
Ding, H.
dc.date.accessioned 2017-08-04T12:29:40Z
dc.date.available 2017-08-04T12:29:40Z
dc.date.issued 2014
dc.identifier.citation Zhang, P., Richard, P., Qian, T., et al.. "Observation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s± Pairing." Physical Review X, 4, no. 3 (2014) American Physical Society: https://doi.org/10.1103/PhysRevX.4.031001.
dc.identifier.urihttps://hdl.handle.net/1911/96574
dc.description.abstract We report the observation by angle-resolved photoemission spectroscopy of an impurity state located inside the superconducting gap of Ba 0.6 K 0.4 Fe 2 As 2 and vanishing above the superconducting critical temperature, for which the spectral weight is confined in momentum space near the Fermi wave-vector positions. We demonstrate, supported by theoretical simulations, that this in-gap state originates from weak scattering between bands with opposite sign of the superconducting-gap phase. This weak scattering, likely due to off-plane nonmagnetic (Ba, K) disorder, occurs mostly among neighboring Fermi surfaces, suggesting that the superconducting-gap phase changes sign within holelike (and electronlike) bands. Our results impose severe restrictions on the models promoted to explain high-temperature superconductivity in these materials.
dc.language.iso eng
dc.publisher American Physical Society
dc.rights This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.title Observation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s± Pairing
dc.type Journal article
dc.citation.journalTitle Physical Review X
dc.citation.volumeNumber 4
dc.citation.issueNumber 3
dc.identifier.digital Observation_Momentum-Confined_In-Gap_Impurity_State
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1103/PhysRevX.4.031001
dc.type.publication publisher version
dc.citation.articleNumber 031001


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